11. Which of the following, when added as an impurity, into the silicon, produces n-type semiconductor ?
(a) Phosphorous
(b) Aluminium
(c) Magnesium
(d) Both b and c
Answer : (a) Phosphorous
n-type
Elements: P, As, Sb
Valency: Pentavalent
p-type
Elements: B, Al, Ga, In
Valency: Trivalent
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